Application of layered double hydroxides in asphalt
摘要
Layered double hydroxides (LDHs), two-dimensional anionic clays with tunable interlayer chemistry, have gained attention in asphalt modification due to their anion-exchange capacity. Research confirms LDHs enhance asphalt’s aging resistance, flame retardancy, and VOCs inhibition. This review examines recent advances in LDHs-modified asphalt systems. “Introduction” and “Synthesis and modification of LDHs” section outline LDH fundamentals and preparation methods, evaluating their advantages/limitations. “Research on physical properties of LDHs modified asphalt” section discusses LDHs’ impacts on asphalt's physical properties, while “Research on aging resistance of LDHs modified asphalt” section details their anti-aging mechanisms against thermal/UV degradation. “Research on flame retardant properties of LDHs modified asphalt” and “Research on VOCs inhibition performance of LDHs modified asphalt” sections analyze flame-retardant pathways and volatile organic compound inhibition. Although LDHs show multi-functional potential through structural design, key challenges remain: clarifying free radical scavenging mechanisms and advancing medium-to-large-scale engineering validations to bridge lab research with practical applications. Future work should prioritize these aspects to enable commercial implementation.